use EqualFold to compare tow strings

[wusphinx]

just use strings.EqualFold to compare tow strings without case sensitive. example is here

[codecov-io]

Codecov Report

Merging #17 into master will increase coverage by 0.06%. The diff coverage is 0%.

@@            Coverage Diff             @@
##           master      #17      +/-   ##
==========================================
+ Coverage   44.28%   44.34%   +0.06%     
==========================================
  Files         149      149              
  Lines       22357    22324      -33     
==========================================
  Hits         9900     9900              
+ Misses      10803    10768      -35     
- Partials     1654     1656       +2

Impacted Files	Coverage Δ
common/util.go	0% <0%> (ø)	:arrow_up:
transport/rafthttp/stream.go	80.13% <0%> (-0.66%)	:arrow_down:
node/ttl.go	35.15% <0%> (ø)	:arrow_up:
transport/rafthttp/peer.go	77.09% <0%> (+1.52%)	:arrow_up:

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[absolute8511]

Can you give a benchmark result for IsMergeScanCommand?

[wusphinx]

Can you give a benchmark result for IsMergeScanCommand? Yeah, I got it as below:

goos: darwin
goarch: amd64
pkg: examples/bench
BenchmarkIsMergeScanCommandNew-4    100000000           17.2 ns/op
BenchmarkIsMergeScanCommandOld-4    1000000000           2.76 ns/op
PASS
ok      examples/bench  4.788s

Obviously, Your code is better than mine on performance, consider that performance is more important than “beauty”, I will close this PR.